sync: add Phase 0 uncommitted session log check

Before invoking sync.sh, /sync now scans for untracked or modified
session log files across session-logs/, clients/*/session-logs/, and
projects/*/session-logs/. If any are found, it warns the user and
offers to run /save instead so logs get a proper narrative commit
rather than a generic "sync: auto-sync" message.

Escalation behavior: default toward /save; user can override to
proceed with plain sync if they explicitly choose.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.claude/commands/sync.md

@@ -1,5 +1,42 @@
 Sync the ClaudeTools and vault repos with Gitea.
 
+## Phase 0 — Uncommitted Session Log Check
+
+**Run this before invoking `sync.sh`.**
+
+```bash
+git status --porcelain | grep -E '\bsession-logs/.*\.md$' | grep -v '^\s*D '
+```
+
+This finds any untracked (`??`) or modified (` M`, `M `, `AM`) session log files across all locations:
+- `session-logs/*.md` (root general logs)
+- `clients/*/session-logs/*.md`
+- `projects/*/session-logs/*.md`
+
+**If count == 0:** proceed with sync normally (invoke `sync.sh`).
+
+**If count > 0:**
+
+Emit:
+```
+[WARNING] Found <N> uncommitted session log(s):
+  - <path/to/file.md>
+  - ...
+
+These contain work context that will be auto-committed with a generic
+"sync: auto-sync" message if you proceed. Run /save instead to capture
+a proper narrative summary before syncing.
+```
+
+Then ask: "Run /save now, or proceed with plain sync anyway?"
+
+- If user says **save** (or doesn't respond / says yes): execute the full `/save` flow (write session log → `sync.sh`). Do NOT call `sync.sh` separately after — `/save` already calls it.
+- If user says **proceed / skip**: invoke `sync.sh` directly and note that the session logs will be auto-committed with generic messages.
+
+The intent: a `/sync` that finds unsaved work should default toward `/save`. Auto-committing session logs with "sync: auto-sync" loses the narrative context that makes logs searchable.
+
+---
+
 ## What this does
 
 Invokes `bash .claude/scripts/sync.sh`, which: